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Phil G4SPZ · 18th Feb 2018, 1:11 am

Have you got a circuit diagram for that 1939 meter, Dave? The 1943 Model 7 circuit that I've seen definitely has the 200k resistor linking the 1.5 volt battery to the movement via leaf switch contacts 'e' and 'f' on AC ranges only. I was just interested to know whether yours has no such resistor fitted, or perhaps it's gone o/c sometime over the past 79 years!

18th Feb 2018, 1:11 am	#1581
Phil G4SPZ Dekatron Join Date: Apr 2005 Location: Bewdley, Worcestershire, UK. Posts: 4,748	Re: AVO Multimeter survey Have you got a circuit diagram for that 1939 meter, Dave? The 1943 Model 7 circuit that I've seen definitely has the 200k resistor linking the 1.5 volt battery to the movement via leaf switch contacts 'e' and 'f' on AC ranges only. I was just interested to know whether yours has no such resistor fitted, or perhaps it's gone o/c sometime over the past 79 years! __________________ Phil Optimist [n]: One who is not in possession of the full facts